linux/fs/nfsd/nfs4proc.c
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   1/*
   2 *  Server-side procedures for NFSv4.
   3 *
   4 *  Copyright (c) 2002 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson   <andros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35#include <linux/file.h>
  36#include <linux/slab.h>
  37
  38#include "idmap.h"
  39#include "cache.h"
  40#include "xdr4.h"
  41#include "vfs.h"
  42#include "current_stateid.h"
  43
  44#define NFSDDBG_FACILITY                NFSDDBG_PROC
  45
  46static u32 nfsd_attrmask[] = {
  47        NFSD_WRITEABLE_ATTRS_WORD0,
  48        NFSD_WRITEABLE_ATTRS_WORD1,
  49        NFSD_WRITEABLE_ATTRS_WORD2
  50};
  51
  52static u32 nfsd41_ex_attrmask[] = {
  53        NFSD_SUPPATTR_EXCLCREAT_WORD0,
  54        NFSD_SUPPATTR_EXCLCREAT_WORD1,
  55        NFSD_SUPPATTR_EXCLCREAT_WORD2
  56};
  57
  58static __be32
  59check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  60                   u32 *bmval, u32 *writable)
  61{
  62        struct dentry *dentry = cstate->current_fh.fh_dentry;
  63
  64        /*
  65         * Check about attributes are supported by the NFSv4 server or not.
  66         * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  67         */
  68        if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  69            (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  70            (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  71                return nfserr_attrnotsupp;
  72
  73        /*
  74         * Check FATTR4_WORD0_ACL can be supported
  75         * in current environment or not.
  76         */
  77        if (bmval[0] & FATTR4_WORD0_ACL) {
  78                if (!IS_POSIXACL(dentry->d_inode))
  79                        return nfserr_attrnotsupp;
  80        }
  81
  82        /*
  83         * According to spec, read-only attributes return ERR_INVAL.
  84         */
  85        if (writable) {
  86                if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  87                    (bmval[2] & ~writable[2]))
  88                        return nfserr_inval;
  89        }
  90
  91        return nfs_ok;
  92}
  93
  94static __be32
  95nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  96        struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  97{
  98        __be32 status = nfs_ok;
  99
 100        if (open->op_create == NFS4_OPEN_CREATE) {
 101                if (open->op_createmode == NFS4_CREATE_UNCHECKED
 102                    || open->op_createmode == NFS4_CREATE_GUARDED)
 103                        status = check_attr_support(rqstp, cstate,
 104                                        open->op_bmval, nfsd_attrmask);
 105                else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 106                        status = check_attr_support(rqstp, cstate,
 107                                        open->op_bmval, nfsd41_ex_attrmask);
 108        }
 109
 110        return status;
 111}
 112
 113static int
 114is_create_with_attrs(struct nfsd4_open *open)
 115{
 116        return open->op_create == NFS4_OPEN_CREATE
 117                && (open->op_createmode == NFS4_CREATE_UNCHECKED
 118                    || open->op_createmode == NFS4_CREATE_GUARDED
 119                    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 120}
 121
 122/*
 123 * if error occurs when setting the acl, just clear the acl bit
 124 * in the returned attr bitmap.
 125 */
 126static void
 127do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 128                struct nfs4_acl *acl, u32 *bmval)
 129{
 130        __be32 status;
 131
 132        status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 133        if (status)
 134                /*
 135                 * We should probably fail the whole open at this point,
 136                 * but we've already created the file, so it's too late;
 137                 * So this seems the least of evils:
 138                 */
 139                bmval[0] &= ~FATTR4_WORD0_ACL;
 140}
 141
 142static inline void
 143fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 144{
 145        fh_put(dst);
 146        dget(src->fh_dentry);
 147        if (src->fh_export)
 148                cache_get(&src->fh_export->h);
 149        *dst = *src;
 150}
 151
 152static __be32
 153do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 154{
 155        __be32 status;
 156
 157        if (open->op_truncate &&
 158                !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 159                return nfserr_inval;
 160
 161        accmode |= NFSD_MAY_READ_IF_EXEC;
 162
 163        if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 164                accmode |= NFSD_MAY_READ;
 165        if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 166                accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 167        if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 168                accmode |= NFSD_MAY_WRITE;
 169
 170        status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 171
 172        return status;
 173}
 174
 175static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 176{
 177        umode_t mode = fh->fh_dentry->d_inode->i_mode;
 178
 179        if (S_ISREG(mode))
 180                return nfs_ok;
 181        if (S_ISDIR(mode))
 182                return nfserr_isdir;
 183        /*
 184         * Using err_symlink as our catch-all case may look odd; but
 185         * there's no other obvious error for this case in 4.0, and we
 186         * happen to know that it will cause the linux v4 client to do
 187         * the right thing on attempts to open something other than a
 188         * regular file.
 189         */
 190        return nfserr_symlink;
 191}
 192
 193static __be32
 194do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 195{
 196        struct svc_fh *resfh;
 197        __be32 status;
 198
 199        resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 200        if (!resfh)
 201                return nfserr_jukebox;
 202        fh_init(resfh, NFS4_FHSIZE);
 203        open->op_truncate = 0;
 204
 205        if (open->op_create) {
 206                /* FIXME: check session persistence and pnfs flags.
 207                 * The nfsv4.1 spec requires the following semantics:
 208                 *
 209                 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 210                 * Reply Cache  | server |                 |
 211                 * -------------+--------+-----------------+--------------------
 212                 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 213                 *              |        |                 | (SHOULD)
 214                 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 215                 *              |        |                 | (SHOULD NOT)
 216                 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 217                 * yes          | no     | GUARDED4        | GUARDED4
 218                 * yes          | yes    | GUARDED4        | GUARDED4
 219                 */
 220
 221                /*
 222                 * Note: create modes (UNCHECKED,GUARDED...) are the same
 223                 * in NFSv4 as in v3 except EXCLUSIVE4_1.
 224                 */
 225                status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 226                                        open->op_fname.len, &open->op_iattr,
 227                                        resfh, open->op_createmode,
 228                                        (u32 *)open->op_verf.data,
 229                                        &open->op_truncate, &open->op_created);
 230
 231                /*
 232                 * Following rfc 3530 14.2.16, use the returned bitmask
 233                 * to indicate which attributes we used to store the
 234                 * verifier:
 235                 */
 236                if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 237                        open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 238                                                        FATTR4_WORD1_TIME_MODIFY);
 239        } else {
 240                status = nfsd_lookup(rqstp, current_fh,
 241                                     open->op_fname.data, open->op_fname.len, resfh);
 242                fh_unlock(current_fh);
 243        }
 244        if (status)
 245                goto out;
 246        status = nfsd_check_obj_isreg(resfh);
 247        if (status)
 248                goto out;
 249
 250        if (is_create_with_attrs(open) && open->op_acl != NULL)
 251                do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 252
 253        /* set reply cache */
 254        fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 255                        &resfh->fh_handle);
 256        if (!open->op_created)
 257                status = do_open_permission(rqstp, resfh, open,
 258                                            NFSD_MAY_NOP);
 259        set_change_info(&open->op_cinfo, current_fh);
 260        fh_dup2(current_fh, resfh);
 261out:
 262        fh_put(resfh);
 263        kfree(resfh);
 264        return status;
 265}
 266
 267static __be32
 268do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 269{
 270        __be32 status;
 271
 272        /* We don't know the target directory, and therefore can not
 273        * set the change info
 274        */
 275
 276        memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 277
 278        /* set replay cache */
 279        fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 280                        &current_fh->fh_handle);
 281
 282        open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 283                (open->op_iattr.ia_size == 0);
 284
 285        status = do_open_permission(rqstp, current_fh, open,
 286                                    NFSD_MAY_OWNER_OVERRIDE);
 287
 288        return status;
 289}
 290
 291static void
 292copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 293{
 294        struct nfsd4_sessionid *sid =
 295                        (struct nfsd4_sessionid *)session->se_sessionid.data;
 296
 297        clid->cl_boot = sid->clientid.cl_boot;
 298        clid->cl_id = sid->clientid.cl_id;
 299}
 300
 301static __be32
 302nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 303           struct nfsd4_open *open)
 304{
 305        __be32 status;
 306        struct nfsd4_compoundres *resp;
 307
 308        dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 309                (int)open->op_fname.len, open->op_fname.data,
 310                open->op_openowner);
 311
 312        /* This check required by spec. */
 313        if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 314                return nfserr_inval;
 315
 316        open->op_created = 0;
 317        /*
 318         * RFC5661 18.51.3
 319         * Before RECLAIM_COMPLETE done, server should deny new lock
 320         */
 321        if (nfsd4_has_session(cstate) &&
 322            !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 323                      &cstate->session->se_client->cl_flags) &&
 324            open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 325                return nfserr_grace;
 326
 327        if (nfsd4_has_session(cstate))
 328                copy_clientid(&open->op_clientid, cstate->session);
 329
 330        nfs4_lock_state();
 331
 332        /* check seqid for replay. set nfs4_owner */
 333        resp = rqstp->rq_resp;
 334        status = nfsd4_process_open1(&resp->cstate, open);
 335        if (status == nfserr_replay_me) {
 336                struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 337                fh_put(&cstate->current_fh);
 338                fh_copy_shallow(&cstate->current_fh.fh_handle,
 339                                &rp->rp_openfh);
 340                status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 341                if (status)
 342                        dprintk("nfsd4_open: replay failed"
 343                                " restoring previous filehandle\n");
 344                else
 345                        status = nfserr_replay_me;
 346        }
 347        if (status)
 348                goto out;
 349
 350        status = nfsd4_check_open_attributes(rqstp, cstate, open);
 351        if (status)
 352                goto out;
 353
 354        /* Openowner is now set, so sequence id will get bumped.  Now we need
 355         * these checks before we do any creates: */
 356        status = nfserr_grace;
 357        if (locks_in_grace(SVC_NET(rqstp)) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 358                goto out;
 359        status = nfserr_no_grace;
 360        if (!locks_in_grace(SVC_NET(rqstp)) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 361                goto out;
 362
 363        switch (open->op_claim_type) {
 364                case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 365                case NFS4_OPEN_CLAIM_NULL:
 366                        status = do_open_lookup(rqstp, &cstate->current_fh,
 367                                                open);
 368                        if (status)
 369                                goto out;
 370                        break;
 371                case NFS4_OPEN_CLAIM_PREVIOUS:
 372                        open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 373                        status = nfs4_check_open_reclaim(&open->op_clientid);
 374                        if (status)
 375                                goto out;
 376                case NFS4_OPEN_CLAIM_FH:
 377                case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 378                        status = do_open_fhandle(rqstp, &cstate->current_fh,
 379                                                 open);
 380                        if (status)
 381                                goto out;
 382                        break;
 383                case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 384                case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 385                        open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 386                        dprintk("NFSD: unsupported OPEN claim type %d\n",
 387                                open->op_claim_type);
 388                        status = nfserr_notsupp;
 389                        goto out;
 390                default:
 391                        dprintk("NFSD: Invalid OPEN claim type %d\n",
 392                                open->op_claim_type);
 393                        status = nfserr_inval;
 394                        goto out;
 395        }
 396        /*
 397         * nfsd4_process_open2() does the actual opening of the file.  If
 398         * successful, it (1) truncates the file if open->op_truncate was
 399         * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 400         */
 401        status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 402        WARN_ON(status && open->op_created);
 403out:
 404        nfsd4_cleanup_open_state(open, status);
 405        if (open->op_openowner)
 406                cstate->replay_owner = &open->op_openowner->oo_owner;
 407        else
 408                nfs4_unlock_state();
 409        return status;
 410}
 411
 412/*
 413 * filehandle-manipulating ops.
 414 */
 415static __be32
 416nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 417            struct svc_fh **getfh)
 418{
 419        if (!cstate->current_fh.fh_dentry)
 420                return nfserr_nofilehandle;
 421
 422        *getfh = &cstate->current_fh;
 423        return nfs_ok;
 424}
 425
 426static __be32
 427nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 428            struct nfsd4_putfh *putfh)
 429{
 430        fh_put(&cstate->current_fh);
 431        cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 432        memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 433               putfh->pf_fhlen);
 434        return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 435}
 436
 437static __be32
 438nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 439                void *arg)
 440{
 441        __be32 status;
 442
 443        fh_put(&cstate->current_fh);
 444        status = exp_pseudoroot(rqstp, &cstate->current_fh);
 445        return status;
 446}
 447
 448static __be32
 449nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 450                void *arg)
 451{
 452        if (!cstate->save_fh.fh_dentry)
 453                return nfserr_restorefh;
 454
 455        fh_dup2(&cstate->current_fh, &cstate->save_fh);
 456        if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 457                memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 458                SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 459        }
 460        return nfs_ok;
 461}
 462
 463static __be32
 464nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 465             void *arg)
 466{
 467        if (!cstate->current_fh.fh_dentry)
 468                return nfserr_nofilehandle;
 469
 470        fh_dup2(&cstate->save_fh, &cstate->current_fh);
 471        if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 472                memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 473                SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 474        }
 475        return nfs_ok;
 476}
 477
 478/*
 479 * misc nfsv4 ops
 480 */
 481static __be32
 482nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 483             struct nfsd4_access *access)
 484{
 485        if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 486                return nfserr_inval;
 487
 488        access->ac_resp_access = access->ac_req_access;
 489        return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 490                           &access->ac_supported);
 491}
 492
 493static void gen_boot_verifier(nfs4_verifier *verifier)
 494{
 495        __be32 verf[2];
 496
 497        verf[0] = (__be32)nfssvc_boot.tv_sec;
 498        verf[1] = (__be32)nfssvc_boot.tv_usec;
 499        memcpy(verifier->data, verf, sizeof(verifier->data));
 500}
 501
 502static __be32
 503nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 504             struct nfsd4_commit *commit)
 505{
 506        gen_boot_verifier(&commit->co_verf);
 507        return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 508                             commit->co_count);
 509}
 510
 511static __be32
 512nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 513             struct nfsd4_create *create)
 514{
 515        struct svc_fh resfh;
 516        __be32 status;
 517        dev_t rdev;
 518
 519        fh_init(&resfh, NFS4_FHSIZE);
 520
 521        status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 522                           NFSD_MAY_CREATE);
 523        if (status)
 524                return status;
 525
 526        status = check_attr_support(rqstp, cstate, create->cr_bmval,
 527                                    nfsd_attrmask);
 528        if (status)
 529                return status;
 530
 531        switch (create->cr_type) {
 532        case NF4LNK:
 533                /* ugh! we have to null-terminate the linktext, or
 534                 * vfs_symlink() will choke.  it is always safe to
 535                 * null-terminate by brute force, since at worst we
 536                 * will overwrite the first byte of the create namelen
 537                 * in the XDR buffer, which has already been extracted
 538                 * during XDR decode.
 539                 */
 540                create->cr_linkname[create->cr_linklen] = 0;
 541
 542                status = nfsd_symlink(rqstp, &cstate->current_fh,
 543                                      create->cr_name, create->cr_namelen,
 544                                      create->cr_linkname, create->cr_linklen,
 545                                      &resfh, &create->cr_iattr);
 546                break;
 547
 548        case NF4BLK:
 549                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 550                if (MAJOR(rdev) != create->cr_specdata1 ||
 551                    MINOR(rdev) != create->cr_specdata2)
 552                        return nfserr_inval;
 553                status = nfsd_create(rqstp, &cstate->current_fh,
 554                                     create->cr_name, create->cr_namelen,
 555                                     &create->cr_iattr, S_IFBLK, rdev, &resfh);
 556                break;
 557
 558        case NF4CHR:
 559                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 560                if (MAJOR(rdev) != create->cr_specdata1 ||
 561                    MINOR(rdev) != create->cr_specdata2)
 562                        return nfserr_inval;
 563                status = nfsd_create(rqstp, &cstate->current_fh,
 564                                     create->cr_name, create->cr_namelen,
 565                                     &create->cr_iattr,S_IFCHR, rdev, &resfh);
 566                break;
 567
 568        case NF4SOCK:
 569                status = nfsd_create(rqstp, &cstate->current_fh,
 570                                     create->cr_name, create->cr_namelen,
 571                                     &create->cr_iattr, S_IFSOCK, 0, &resfh);
 572                break;
 573
 574        case NF4FIFO:
 575                status = nfsd_create(rqstp, &cstate->current_fh,
 576                                     create->cr_name, create->cr_namelen,
 577                                     &create->cr_iattr, S_IFIFO, 0, &resfh);
 578                break;
 579
 580        case NF4DIR:
 581                create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 582                status = nfsd_create(rqstp, &cstate->current_fh,
 583                                     create->cr_name, create->cr_namelen,
 584                                     &create->cr_iattr, S_IFDIR, 0, &resfh);
 585                break;
 586
 587        default:
 588                status = nfserr_badtype;
 589        }
 590
 591        if (status)
 592                goto out;
 593
 594        if (create->cr_acl != NULL)
 595                do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 596                                create->cr_bmval);
 597
 598        fh_unlock(&cstate->current_fh);
 599        set_change_info(&create->cr_cinfo, &cstate->current_fh);
 600        fh_dup2(&cstate->current_fh, &resfh);
 601out:
 602        fh_put(&resfh);
 603        return status;
 604}
 605
 606static __be32
 607nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 608              struct nfsd4_getattr *getattr)
 609{
 610        __be32 status;
 611
 612        status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 613        if (status)
 614                return status;
 615
 616        if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 617                return nfserr_inval;
 618
 619        getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 620        getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 621        getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 622
 623        getattr->ga_fhp = &cstate->current_fh;
 624        return nfs_ok;
 625}
 626
 627static __be32
 628nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 629           struct nfsd4_link *link)
 630{
 631        __be32 status = nfserr_nofilehandle;
 632
 633        if (!cstate->save_fh.fh_dentry)
 634                return status;
 635        status = nfsd_link(rqstp, &cstate->current_fh,
 636                           link->li_name, link->li_namelen, &cstate->save_fh);
 637        if (!status)
 638                set_change_info(&link->li_cinfo, &cstate->current_fh);
 639        return status;
 640}
 641
 642static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 643{
 644        struct svc_fh tmp_fh;
 645        __be32 ret;
 646
 647        fh_init(&tmp_fh, NFS4_FHSIZE);
 648        ret = exp_pseudoroot(rqstp, &tmp_fh);
 649        if (ret)
 650                return ret;
 651        if (tmp_fh.fh_dentry == fh->fh_dentry) {
 652                fh_put(&tmp_fh);
 653                return nfserr_noent;
 654        }
 655        fh_put(&tmp_fh);
 656        return nfsd_lookup(rqstp, fh, "..", 2, fh);
 657}
 658
 659static __be32
 660nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 661              void *arg)
 662{
 663        return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 664}
 665
 666static __be32
 667nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 668             struct nfsd4_lookup *lookup)
 669{
 670        return nfsd_lookup(rqstp, &cstate->current_fh,
 671                           lookup->lo_name, lookup->lo_len,
 672                           &cstate->current_fh);
 673}
 674
 675static __be32
 676nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 677           struct nfsd4_read *read)
 678{
 679        __be32 status;
 680
 681        /* no need to check permission - this will be done in nfsd_read() */
 682
 683        read->rd_filp = NULL;
 684        if (read->rd_offset >= OFFSET_MAX)
 685                return nfserr_inval;
 686
 687        nfs4_lock_state();
 688        /* check stateid */
 689        if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 690                                                 cstate, &read->rd_stateid,
 691                                                 RD_STATE, &read->rd_filp))) {
 692                dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 693                goto out;
 694        }
 695        if (read->rd_filp)
 696                get_file(read->rd_filp);
 697        status = nfs_ok;
 698out:
 699        nfs4_unlock_state();
 700        read->rd_rqstp = rqstp;
 701        read->rd_fhp = &cstate->current_fh;
 702        return status;
 703}
 704
 705static __be32
 706nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 707              struct nfsd4_readdir *readdir)
 708{
 709        u64 cookie = readdir->rd_cookie;
 710        static const nfs4_verifier zeroverf;
 711
 712        /* no need to check permission - this will be done in nfsd_readdir() */
 713
 714        if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 715                return nfserr_inval;
 716
 717        readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 718        readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 719        readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 720
 721        if ((cookie == 1) || (cookie == 2) ||
 722            (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 723                return nfserr_bad_cookie;
 724
 725        readdir->rd_rqstp = rqstp;
 726        readdir->rd_fhp = &cstate->current_fh;
 727        return nfs_ok;
 728}
 729
 730static __be32
 731nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 732               struct nfsd4_readlink *readlink)
 733{
 734        readlink->rl_rqstp = rqstp;
 735        readlink->rl_fhp = &cstate->current_fh;
 736        return nfs_ok;
 737}
 738
 739static __be32
 740nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 741             struct nfsd4_remove *remove)
 742{
 743        __be32 status;
 744
 745        if (locks_in_grace(SVC_NET(rqstp)))
 746                return nfserr_grace;
 747        status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 748                             remove->rm_name, remove->rm_namelen);
 749        if (!status) {
 750                fh_unlock(&cstate->current_fh);
 751                set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 752        }
 753        return status;
 754}
 755
 756static __be32
 757nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 758             struct nfsd4_rename *rename)
 759{
 760        __be32 status = nfserr_nofilehandle;
 761
 762        if (!cstate->save_fh.fh_dentry)
 763                return status;
 764        if (locks_in_grace(SVC_NET(rqstp)) &&
 765                !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 766                return nfserr_grace;
 767        status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 768                             rename->rn_snamelen, &cstate->current_fh,
 769                             rename->rn_tname, rename->rn_tnamelen);
 770
 771        /* the underlying filesystem returns different error's than required
 772         * by NFSv4. both save_fh and current_fh have been verified.. */
 773        if (status == nfserr_isdir)
 774                status = nfserr_exist;
 775        else if ((status == nfserr_notdir) &&
 776                  (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 777                   S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 778                status = nfserr_exist;
 779
 780        if (!status) {
 781                set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 782                set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 783        }
 784        return status;
 785}
 786
 787static __be32
 788nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 789              struct nfsd4_secinfo *secinfo)
 790{
 791        struct svc_fh resfh;
 792        struct svc_export *exp;
 793        struct dentry *dentry;
 794        __be32 err;
 795
 796        fh_init(&resfh, NFS4_FHSIZE);
 797        err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 798        if (err)
 799                return err;
 800        err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 801                                    secinfo->si_name, secinfo->si_namelen,
 802                                    &exp, &dentry);
 803        if (err)
 804                return err;
 805        if (dentry->d_inode == NULL) {
 806                exp_put(exp);
 807                err = nfserr_noent;
 808        } else
 809                secinfo->si_exp = exp;
 810        dput(dentry);
 811        if (cstate->minorversion)
 812                /* See rfc 5661 section 2.6.3.1.1.8 */
 813                fh_put(&cstate->current_fh);
 814        return err;
 815}
 816
 817static __be32
 818nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 819              struct nfsd4_secinfo_no_name *sin)
 820{
 821        __be32 err;
 822
 823        switch (sin->sin_style) {
 824        case NFS4_SECINFO_STYLE4_CURRENT_FH:
 825                break;
 826        case NFS4_SECINFO_STYLE4_PARENT:
 827                err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 828                if (err)
 829                        return err;
 830                break;
 831        default:
 832                return nfserr_inval;
 833        }
 834        exp_get(cstate->current_fh.fh_export);
 835        sin->sin_exp = cstate->current_fh.fh_export;
 836        fh_put(&cstate->current_fh);
 837        return nfs_ok;
 838}
 839
 840static __be32
 841nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 842              struct nfsd4_setattr *setattr)
 843{
 844        __be32 status = nfs_ok;
 845        int err;
 846
 847        if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 848                nfs4_lock_state();
 849                status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 850                        &setattr->sa_stateid, WR_STATE, NULL);
 851                nfs4_unlock_state();
 852                if (status) {
 853                        dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 854                        return status;
 855                }
 856        }
 857        err = fh_want_write(&cstate->current_fh);
 858        if (err)
 859                return nfserrno(err);
 860        status = nfs_ok;
 861
 862        status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 863                                    nfsd_attrmask);
 864        if (status)
 865                goto out;
 866
 867        if (setattr->sa_acl != NULL)
 868                status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 869                                            setattr->sa_acl);
 870        if (status)
 871                goto out;
 872        status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 873                                0, (time_t)0);
 874out:
 875        fh_drop_write(&cstate->current_fh);
 876        return status;
 877}
 878
 879static __be32
 880nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 881            struct nfsd4_write *write)
 882{
 883        stateid_t *stateid = &write->wr_stateid;
 884        struct file *filp = NULL;
 885        __be32 status = nfs_ok;
 886        unsigned long cnt;
 887
 888        /* no need to check permission - this will be done in nfsd_write() */
 889
 890        if (write->wr_offset >= OFFSET_MAX)
 891                return nfserr_inval;
 892
 893        nfs4_lock_state();
 894        status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 895                                        cstate, stateid, WR_STATE, &filp);
 896        if (filp)
 897                get_file(filp);
 898        nfs4_unlock_state();
 899
 900        if (status) {
 901                dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 902                return status;
 903        }
 904
 905        cnt = write->wr_buflen;
 906        write->wr_how_written = write->wr_stable_how;
 907        gen_boot_verifier(&write->wr_verifier);
 908
 909        status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 910                             write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 911                             &cnt, &write->wr_how_written);
 912        if (filp)
 913                fput(filp);
 914
 915        write->wr_bytes_written = cnt;
 916
 917        return status;
 918}
 919
 920/* This routine never returns NFS_OK!  If there are no other errors, it
 921 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 922 * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 923 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 924 */
 925static __be32
 926_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 927             struct nfsd4_verify *verify)
 928{
 929        __be32 *buf, *p;
 930        int count;
 931        __be32 status;
 932
 933        status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 934        if (status)
 935                return status;
 936
 937        status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 938        if (status)
 939                return status;
 940
 941        if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 942            || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 943                return nfserr_inval;
 944        if (verify->ve_attrlen & 3)
 945                return nfserr_inval;
 946
 947        /* count in words:
 948         *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 949         */
 950        count = 4 + (verify->ve_attrlen >> 2);
 951        buf = kmalloc(count << 2, GFP_KERNEL);
 952        if (!buf)
 953                return nfserr_jukebox;
 954
 955        status = nfsd4_encode_fattr(&cstate->current_fh,
 956                                    cstate->current_fh.fh_export,
 957                                    cstate->current_fh.fh_dentry, buf,
 958                                    &count, verify->ve_bmval,
 959                                    rqstp, 0);
 960
 961        /* this means that nfsd4_encode_fattr() ran out of space */
 962        if (status == nfserr_resource && count == 0)
 963                status = nfserr_not_same;
 964        if (status)
 965                goto out_kfree;
 966
 967        /* skip bitmap */
 968        p = buf + 1 + ntohl(buf[0]);
 969        status = nfserr_not_same;
 970        if (ntohl(*p++) != verify->ve_attrlen)
 971                goto out_kfree;
 972        if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 973                status = nfserr_same;
 974
 975out_kfree:
 976        kfree(buf);
 977        return status;
 978}
 979
 980static __be32
 981nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 982              struct nfsd4_verify *verify)
 983{
 984        __be32 status;
 985
 986        status = _nfsd4_verify(rqstp, cstate, verify);
 987        return status == nfserr_not_same ? nfs_ok : status;
 988}
 989
 990static __be32
 991nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 992             struct nfsd4_verify *verify)
 993{
 994        __be32 status;
 995
 996        status = _nfsd4_verify(rqstp, cstate, verify);
 997        return status == nfserr_same ? nfs_ok : status;
 998}
 999
1000/*
1001 * NULL call.
1002 */
1003static __be32
1004nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1005{
1006        return nfs_ok;
1007}
1008
1009static inline void nfsd4_increment_op_stats(u32 opnum)
1010{
1011        if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1012                nfsdstats.nfs4_opcount[opnum]++;
1013}
1014
1015typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1016                              void *);
1017typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1018typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1019typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1020
1021enum nfsd4_op_flags {
1022        ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1023        ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1024        ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1025        /* For rfc 5661 section 2.6.3.1.1: */
1026        OP_HANDLES_WRONGSEC = 1 << 3,
1027        OP_IS_PUTFH_LIKE = 1 << 4,
1028        /*
1029         * These are the ops whose result size we estimate before
1030         * encoding, to avoid performing an op then not being able to
1031         * respond or cache a response.  This includes writes and setattrs
1032         * as well as the operations usually called "nonidempotent":
1033         */
1034        OP_MODIFIES_SOMETHING = 1 << 5,
1035        /*
1036         * Cache compounds containing these ops in the xid-based drc:
1037         * We use the DRC for compounds containing non-idempotent
1038         * operations, *except* those that are 4.1-specific (since
1039         * sessions provide their own EOS), and except for stateful
1040         * operations other than setclientid and setclientid_confirm
1041         * (since sequence numbers provide EOS for open, lock, etc in
1042         * the v4.0 case).
1043         */
1044        OP_CACHEME = 1 << 6,
1045        /*
1046         * These are ops which clear current state id.
1047         */
1048        OP_CLEAR_STATEID = 1 << 7,
1049};
1050
1051struct nfsd4_operation {
1052        nfsd4op_func op_func;
1053        u32 op_flags;
1054        char *op_name;
1055        /* Try to get response size before operation */
1056        nfsd4op_rsize op_rsize_bop;
1057        stateid_setter op_get_currentstateid;
1058        stateid_getter op_set_currentstateid;
1059};
1060
1061static struct nfsd4_operation nfsd4_ops[];
1062
1063#ifdef NFSD_DEBUG
1064static const char *nfsd4_op_name(unsigned opnum);
1065#endif
1066
1067/*
1068 * Enforce NFSv4.1 COMPOUND ordering rules:
1069 *
1070 * Also note, enforced elsewhere:
1071 *      - SEQUENCE other than as first op results in
1072 *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1073 *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1074 *        (Enforced in nfsd4_bind_conn_to_session().)
1075 *      - DESTROY_SESSION must be the final operation in a compound, if
1076 *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1077 *        (Enforced in nfsd4_destroy_session().)
1078 */
1079static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1080{
1081        struct nfsd4_op *op = &args->ops[0];
1082
1083        /* These ordering requirements don't apply to NFSv4.0: */
1084        if (args->minorversion == 0)
1085                return nfs_ok;
1086        /* This is weird, but OK, not our problem: */
1087        if (args->opcnt == 0)
1088                return nfs_ok;
1089        if (op->status == nfserr_op_illegal)
1090                return nfs_ok;
1091        if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1092                return nfserr_op_not_in_session;
1093        if (op->opnum == OP_SEQUENCE)
1094                return nfs_ok;
1095        if (args->opcnt != 1)
1096                return nfserr_not_only_op;
1097        return nfs_ok;
1098}
1099
1100static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1101{
1102        return &nfsd4_ops[op->opnum];
1103}
1104
1105bool nfsd4_cache_this_op(struct nfsd4_op *op)
1106{
1107        return OPDESC(op)->op_flags & OP_CACHEME;
1108}
1109
1110static bool need_wrongsec_check(struct svc_rqst *rqstp)
1111{
1112        struct nfsd4_compoundres *resp = rqstp->rq_resp;
1113        struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1114        struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1115        struct nfsd4_op *next = &argp->ops[resp->opcnt];
1116        struct nfsd4_operation *thisd;
1117        struct nfsd4_operation *nextd;
1118
1119        thisd = OPDESC(this);
1120        /*
1121         * Most ops check wronsec on our own; only the putfh-like ops
1122         * have special rules.
1123         */
1124        if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1125                return false;
1126        /*
1127         * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1128         * put-filehandle operation if we're not going to use the
1129         * result:
1130         */
1131        if (argp->opcnt == resp->opcnt)
1132                return false;
1133
1134        nextd = OPDESC(next);
1135        /*
1136         * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1137         * errors themselves as necessary; others should check for them
1138         * now:
1139         */
1140        return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1141}
1142
1143/*
1144 * COMPOUND call.
1145 */
1146static __be32
1147nfsd4_proc_compound(struct svc_rqst *rqstp,
1148                    struct nfsd4_compoundargs *args,
1149                    struct nfsd4_compoundres *resp)
1150{
1151        struct nfsd4_op *op;
1152        struct nfsd4_operation *opdesc;
1153        struct nfsd4_compound_state *cstate = &resp->cstate;
1154        int             slack_bytes;
1155        u32             plen = 0;
1156        __be32          status;
1157
1158        resp->xbuf = &rqstp->rq_res;
1159        resp->p = rqstp->rq_res.head[0].iov_base +
1160                                                rqstp->rq_res.head[0].iov_len;
1161        resp->tagp = resp->p;
1162        /* reserve space for: taglen, tag, and opcnt */
1163        resp->p += 2 + XDR_QUADLEN(args->taglen);
1164        resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1165        resp->taglen = args->taglen;
1166        resp->tag = args->tag;
1167        resp->opcnt = 0;
1168        resp->rqstp = rqstp;
1169        resp->cstate.minorversion = args->minorversion;
1170        resp->cstate.replay_owner = NULL;
1171        resp->cstate.session = NULL;
1172        fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1173        fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1174        /*
1175         * Don't use the deferral mechanism for NFSv4; compounds make it
1176         * too hard to avoid non-idempotency problems.
1177         */
1178        rqstp->rq_usedeferral = 0;
1179
1180        /*
1181         * According to RFC3010, this takes precedence over all other errors.
1182         */
1183        status = nfserr_minor_vers_mismatch;
1184        if (args->minorversion > nfsd_supported_minorversion)
1185                goto out;
1186
1187        status = nfs41_check_op_ordering(args);
1188        if (status) {
1189                op = &args->ops[0];
1190                op->status = status;
1191                goto encode_op;
1192        }
1193
1194        while (!status && resp->opcnt < args->opcnt) {
1195                op = &args->ops[resp->opcnt++];
1196
1197                dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1198                        resp->opcnt, args->opcnt, op->opnum,
1199                        nfsd4_op_name(op->opnum));
1200                /*
1201                 * The XDR decode routines may have pre-set op->status;
1202                 * for example, if there is a miscellaneous XDR error
1203                 * it will be set to nfserr_bad_xdr.
1204                 */
1205                if (op->status)
1206                        goto encode_op;
1207
1208                /* We must be able to encode a successful response to
1209                 * this operation, with enough room left over to encode a
1210                 * failed response to the next operation.  If we don't
1211                 * have enough room, fail with ERR_RESOURCE.
1212                 */
1213                slack_bytes = (char *)resp->end - (char *)resp->p;
1214                if (slack_bytes < COMPOUND_SLACK_SPACE
1215                                + COMPOUND_ERR_SLACK_SPACE) {
1216                        BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1217                        op->status = nfserr_resource;
1218                        goto encode_op;
1219                }
1220
1221                opdesc = OPDESC(op);
1222
1223                if (!cstate->current_fh.fh_dentry) {
1224                        if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1225                                op->status = nfserr_nofilehandle;
1226                                goto encode_op;
1227                        }
1228                } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1229                          !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1230                        op->status = nfserr_moved;
1231                        goto encode_op;
1232                }
1233
1234                /* If op is non-idempotent */
1235                if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1236                        plen = opdesc->op_rsize_bop(rqstp, op);
1237                        op->status = nfsd4_check_resp_size(resp, plen);
1238                }
1239
1240                if (op->status)
1241                        goto encode_op;
1242
1243                if (opdesc->op_func) {
1244                        if (opdesc->op_get_currentstateid)
1245                                opdesc->op_get_currentstateid(cstate, &op->u);
1246                        op->status = opdesc->op_func(rqstp, cstate, &op->u);
1247                } else
1248                        BUG_ON(op->status == nfs_ok);
1249
1250                if (!op->status) {
1251                        if (opdesc->op_set_currentstateid)
1252                                opdesc->op_set_currentstateid(cstate, &op->u);
1253
1254                        if (opdesc->op_flags & OP_CLEAR_STATEID)
1255                                clear_current_stateid(cstate);
1256
1257                        if (need_wrongsec_check(rqstp))
1258                                op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1259                }
1260
1261encode_op:
1262                /* Only from SEQUENCE */
1263                if (resp->cstate.status == nfserr_replay_cache) {
1264                        dprintk("%s NFS4.1 replay from cache\n", __func__);
1265                        status = op->status;
1266                        goto out;
1267                }
1268                if (op->status == nfserr_replay_me) {
1269                        op->replay = &cstate->replay_owner->so_replay;
1270                        nfsd4_encode_replay(resp, op);
1271                        status = op->status = op->replay->rp_status;
1272                } else {
1273                        nfsd4_encode_operation(resp, op);
1274                        status = op->status;
1275                }
1276
1277                dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1278                        args->ops, args->opcnt, resp->opcnt, op->opnum,
1279                        be32_to_cpu(status));
1280
1281                if (cstate->replay_owner) {
1282                        nfs4_unlock_state();
1283                        cstate->replay_owner = NULL;
1284                }
1285                /* XXX Ugh, we need to get rid of this kind of special case: */
1286                if (op->opnum == OP_READ && op->u.read.rd_filp)
1287                        fput(op->u.read.rd_filp);
1288
1289                nfsd4_increment_op_stats(op->opnum);
1290        }
1291
1292        resp->cstate.status = status;
1293        fh_put(&resp->cstate.current_fh);
1294        fh_put(&resp->cstate.save_fh);
1295        BUG_ON(resp->cstate.replay_owner);
1296out:
1297        /* Reset deferral mechanism for RPC deferrals */
1298        rqstp->rq_usedeferral = 1;
1299        dprintk("nfsv4 compound returned %d\n", ntohl(status));
1300        return status;
1301}
1302
1303#define op_encode_hdr_size              (2)
1304#define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1305#define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1306#define op_encode_change_info_maxsz     (5)
1307#define nfs4_fattr_bitmap_maxsz         (4)
1308
1309#define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1310#define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1311
1312#define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1313
1314#define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1315#define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1316                                         op_encode_ace_maxsz)
1317
1318#define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1319
1320static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1321{
1322        return (op_encode_hdr_size) * sizeof(__be32);
1323}
1324
1325static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1326{
1327        return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1328}
1329
1330static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1331{
1332        return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1333}
1334
1335static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1336{
1337        return (op_encode_hdr_size + op_encode_change_info_maxsz
1338                + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1339}
1340
1341static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1342{
1343        return (op_encode_hdr_size + op_encode_change_info_maxsz)
1344                * sizeof(__be32);
1345}
1346
1347static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1348{
1349        return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1350                * sizeof(__be32);
1351}
1352
1353static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1354{
1355        return (op_encode_hdr_size + op_encode_stateid_maxsz
1356                + op_encode_change_info_maxsz + 1
1357                + nfs4_fattr_bitmap_maxsz
1358                + op_encode_delegation_maxsz) * sizeof(__be32);
1359}
1360
1361static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1362{
1363        u32 maxcount = 0, rlen = 0;
1364
1365        maxcount = svc_max_payload(rqstp);
1366        rlen = op->u.read.rd_length;
1367
1368        if (rlen > maxcount)
1369                rlen = maxcount;
1370
1371        return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1372}
1373
1374static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1375{
1376        u32 rlen = op->u.readdir.rd_maxcount;
1377
1378        if (rlen > PAGE_SIZE)
1379                rlen = PAGE_SIZE;
1380
1381        return (op_encode_hdr_size + op_encode_verifier_maxsz)
1382                 * sizeof(__be32) + rlen;
1383}
1384
1385static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1386{
1387        return (op_encode_hdr_size + op_encode_change_info_maxsz)
1388                * sizeof(__be32);
1389}
1390
1391static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1392{
1393        return (op_encode_hdr_size + op_encode_change_info_maxsz
1394                + op_encode_change_info_maxsz) * sizeof(__be32);
1395}
1396
1397static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1398{
1399        return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1400}
1401
1402static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1403{
1404        return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1405}
1406
1407static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1408{
1409        return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1410}
1411
1412static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1413{
1414        return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1415                1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1416                2 + /*eir_server_owner.so_minor_id */\
1417                /* eir_server_owner.so_major_id<> */\
1418                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1419                /* eir_server_scope<> */\
1420                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1421                1 + /* eir_server_impl_id array length */\
1422                0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1423}
1424
1425static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1426{
1427        return (op_encode_hdr_size + \
1428                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1429                2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1430}
1431
1432static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1433{
1434        return (op_encode_hdr_size + \
1435                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1436                2 + /* csr_sequence, csr_flags */\
1437                op_encode_channel_attrs_maxsz + \
1438                op_encode_channel_attrs_maxsz) * sizeof(__be32);
1439}
1440
1441static struct nfsd4_operation nfsd4_ops[] = {
1442        [OP_ACCESS] = {
1443                .op_func = (nfsd4op_func)nfsd4_access,
1444                .op_name = "OP_ACCESS",
1445        },
1446        [OP_CLOSE] = {
1447                .op_func = (nfsd4op_func)nfsd4_close,
1448                .op_flags = OP_MODIFIES_SOMETHING,
1449                .op_name = "OP_CLOSE",
1450                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1451                .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1452                .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1453        },
1454        [OP_COMMIT] = {
1455                .op_func = (nfsd4op_func)nfsd4_commit,
1456                .op_flags = OP_MODIFIES_SOMETHING,
1457                .op_name = "OP_COMMIT",
1458                .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1459        },
1460        [OP_CREATE] = {
1461                .op_func = (nfsd4op_func)nfsd4_create,
1462                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1463                .op_name = "OP_CREATE",
1464                .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1465        },
1466        [OP_DELEGRETURN] = {
1467                .op_func = (nfsd4op_func)nfsd4_delegreturn,
1468                .op_flags = OP_MODIFIES_SOMETHING,
1469                .op_name = "OP_DELEGRETURN",
1470                .op_rsize_bop = nfsd4_only_status_rsize,
1471                .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1472        },
1473        [OP_GETATTR] = {
1474                .op_func = (nfsd4op_func)nfsd4_getattr,
1475                .op_flags = ALLOWED_ON_ABSENT_FS,
1476                .op_name = "OP_GETATTR",
1477        },
1478        [OP_GETFH] = {
1479                .op_func = (nfsd4op_func)nfsd4_getfh,
1480                .op_name = "OP_GETFH",
1481        },
1482        [OP_LINK] = {
1483                .op_func = (nfsd4op_func)nfsd4_link,
1484                .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1485                                | OP_CACHEME,
1486                .op_name = "OP_LINK",
1487                .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1488        },
1489        [OP_LOCK] = {
1490                .op_func = (nfsd4op_func)nfsd4_lock,
1491                .op_flags = OP_MODIFIES_SOMETHING,
1492                .op_name = "OP_LOCK",
1493                .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1494                .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1495        },
1496        [OP_LOCKT] = {
1497                .op_func = (nfsd4op_func)nfsd4_lockt,
1498                .op_name = "OP_LOCKT",
1499        },
1500        [OP_LOCKU] = {
1501                .op_func = (nfsd4op_func)nfsd4_locku,
1502                .op_flags = OP_MODIFIES_SOMETHING,
1503                .op_name = "OP_LOCKU",
1504                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1505                .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1506        },
1507        [OP_LOOKUP] = {
1508                .op_func = (nfsd4op_func)nfsd4_lookup,
1509                .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1510                .op_name = "OP_LOOKUP",
1511        },
1512        [OP_LOOKUPP] = {
1513                .op_func = (nfsd4op_func)nfsd4_lookupp,
1514                .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1515                .op_name = "OP_LOOKUPP",
1516        },
1517        [OP_NVERIFY] = {
1518                .op_func = (nfsd4op_func)nfsd4_nverify,
1519                .op_name = "OP_NVERIFY",
1520        },
1521        [OP_OPEN] = {
1522                .op_func = (nfsd4op_func)nfsd4_open,
1523                .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1524                .op_name = "OP_OPEN",
1525                .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1526                .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1527        },
1528        [OP_OPEN_CONFIRM] = {
1529                .op_func = (nfsd4op_func)nfsd4_open_confirm,
1530                .op_flags = OP_MODIFIES_SOMETHING,
1531                .op_name = "OP_OPEN_CONFIRM",
1532                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1533        },
1534        [OP_OPEN_DOWNGRADE] = {
1535                .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1536                .op_flags = OP_MODIFIES_SOMETHING,
1537                .op_name = "OP_OPEN_DOWNGRADE",
1538                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1539                .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1540                .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1541        },
1542        [OP_PUTFH] = {
1543                .op_func = (nfsd4op_func)nfsd4_putfh,
1544                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1545                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1546                                | OP_CLEAR_STATEID,
1547                .op_name = "OP_PUTFH",
1548                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1549        },
1550        [OP_PUTPUBFH] = {
1551                .op_func = (nfsd4op_func)nfsd4_putrootfh,
1552                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1553                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1554                                | OP_CLEAR_STATEID,
1555                .op_name = "OP_PUTPUBFH",
1556                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1557        },
1558        [OP_PUTROOTFH] = {
1559                .op_func = (nfsd4op_func)nfsd4_putrootfh,
1560                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1561                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1562                                | OP_CLEAR_STATEID,
1563                .op_name = "OP_PUTROOTFH",
1564                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1565        },
1566        [OP_READ] = {
1567                .op_func = (nfsd4op_func)nfsd4_read,
1568                .op_flags = OP_MODIFIES_SOMETHING,
1569                .op_name = "OP_READ",
1570                .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1571                .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1572        },
1573        [OP_READDIR] = {
1574                .op_func = (nfsd4op_func)nfsd4_readdir,
1575                .op_flags = OP_MODIFIES_SOMETHING,
1576                .op_name = "OP_READDIR",
1577                .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1578        },
1579        [OP_READLINK] = {
1580                .op_func = (nfsd4op_func)nfsd4_readlink,
1581                .op_name = "OP_READLINK",
1582        },
1583        [OP_REMOVE] = {
1584                .op_func = (nfsd4op_func)nfsd4_remove,
1585                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1586                .op_name = "OP_REMOVE",
1587                .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1588        },
1589        [OP_RENAME] = {
1590                .op_func = (nfsd4op_func)nfsd4_rename,
1591                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1592                .op_name = "OP_RENAME",
1593                .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1594        },
1595        [OP_RENEW] = {
1596                .op_func = (nfsd4op_func)nfsd4_renew,
1597                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1598                                | OP_MODIFIES_SOMETHING,
1599                .op_name = "OP_RENEW",
1600                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1601
1602        },
1603        [OP_RESTOREFH] = {
1604                .op_func = (nfsd4op_func)nfsd4_restorefh,
1605                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1606                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1607                .op_name = "OP_RESTOREFH",
1608                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1609        },
1610        [OP_SAVEFH] = {
1611                .op_func = (nfsd4op_func)nfsd4_savefh,
1612                .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1613                .op_name = "OP_SAVEFH",
1614                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1615        },
1616        [OP_SECINFO] = {
1617                .op_func = (nfsd4op_func)nfsd4_secinfo,
1618                .op_flags = OP_HANDLES_WRONGSEC,
1619                .op_name = "OP_SECINFO",
1620        },
1621        [OP_SETATTR] = {
1622                .op_func = (nfsd4op_func)nfsd4_setattr,
1623                .op_name = "OP_SETATTR",
1624                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1625                .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1626                .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1627        },
1628        [OP_SETCLIENTID] = {
1629                .op_func = (nfsd4op_func)nfsd4_setclientid,
1630                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1631                                | OP_MODIFIES_SOMETHING | OP_CACHEME,
1632                .op_name = "OP_SETCLIENTID",
1633                .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1634        },
1635        [OP_SETCLIENTID_CONFIRM] = {
1636                .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1637                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1638                                | OP_MODIFIES_SOMETHING | OP_CACHEME,
1639                .op_name = "OP_SETCLIENTID_CONFIRM",
1640                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1641        },
1642        [OP_VERIFY] = {
1643                .op_func = (nfsd4op_func)nfsd4_verify,
1644                .op_name = "OP_VERIFY",
1645        },
1646        [OP_WRITE] = {
1647                .op_func = (nfsd4op_func)nfsd4_write,
1648                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1649                .op_name = "OP_WRITE",
1650                .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1651                .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1652        },
1653        [OP_RELEASE_LOCKOWNER] = {
1654                .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1655                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1656                                | OP_MODIFIES_SOMETHING,
1657                .op_name = "OP_RELEASE_LOCKOWNER",
1658                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1659        },
1660
1661        /* NFSv4.1 operations */
1662        [OP_EXCHANGE_ID] = {
1663                .op_func = (nfsd4op_func)nfsd4_exchange_id,
1664                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1665                                | OP_MODIFIES_SOMETHING,
1666                .op_name = "OP_EXCHANGE_ID",
1667                .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1668        },
1669        [OP_BIND_CONN_TO_SESSION] = {
1670                .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1671                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1672                                | OP_MODIFIES_SOMETHING,
1673                .op_name = "OP_BIND_CONN_TO_SESSION",
1674                .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1675        },
1676        [OP_CREATE_SESSION] = {
1677                .op_func = (nfsd4op_func)nfsd4_create_session,
1678                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1679                                | OP_MODIFIES_SOMETHING,
1680                .op_name = "OP_CREATE_SESSION",
1681                .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1682        },
1683        [OP_DESTROY_SESSION] = {
1684                .op_func = (nfsd4op_func)nfsd4_destroy_session,
1685                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1686                                | OP_MODIFIES_SOMETHING,
1687                .op_name = "OP_DESTROY_SESSION",
1688                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1689        },
1690        [OP_SEQUENCE] = {
1691                .op_func = (nfsd4op_func)nfsd4_sequence,
1692                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1693                .op_name = "OP_SEQUENCE",
1694        },
1695        [OP_DESTROY_CLIENTID] = {
1696                .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1697                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1698                                | OP_MODIFIES_SOMETHING,
1699                .op_name = "OP_DESTROY_CLIENTID",
1700                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1701        },
1702        [OP_RECLAIM_COMPLETE] = {
1703                .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1704                .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1705                .op_name = "OP_RECLAIM_COMPLETE",
1706                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1707        },
1708        [OP_SECINFO_NO_NAME] = {
1709                .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1710                .op_flags = OP_HANDLES_WRONGSEC,
1711                .op_name = "OP_SECINFO_NO_NAME",
1712        },
1713        [OP_TEST_STATEID] = {
1714                .op_func = (nfsd4op_func)nfsd4_test_stateid,
1715                .op_flags = ALLOWED_WITHOUT_FH,
1716                .op_name = "OP_TEST_STATEID",
1717        },
1718        [OP_FREE_STATEID] = {
1719                .op_func = (nfsd4op_func)nfsd4_free_stateid,
1720                .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1721                .op_name = "OP_FREE_STATEID",
1722                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1723        },
1724};
1725
1726#ifdef NFSD_DEBUG
1727static const char *nfsd4_op_name(unsigned opnum)
1728{
1729        if (opnum < ARRAY_SIZE(nfsd4_ops))
1730                return nfsd4_ops[opnum].op_name;
1731        return "unknown_operation";
1732}
1733#endif
1734
1735#define nfsd4_voidres                   nfsd4_voidargs
1736struct nfsd4_voidargs { int dummy; };
1737
1738static struct svc_procedure             nfsd_procedures4[2] = {
1739        [NFSPROC4_NULL] = {
1740                .pc_func = (svc_procfunc) nfsd4_proc_null,
1741                .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1742                .pc_argsize = sizeof(struct nfsd4_voidargs),
1743                .pc_ressize = sizeof(struct nfsd4_voidres),
1744                .pc_cachetype = RC_NOCACHE,
1745                .pc_xdrressize = 1,
1746        },
1747        [NFSPROC4_COMPOUND] = {
1748                .pc_func = (svc_procfunc) nfsd4_proc_compound,
1749                .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1750                .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1751                .pc_argsize = sizeof(struct nfsd4_compoundargs),
1752                .pc_ressize = sizeof(struct nfsd4_compoundres),
1753                .pc_release = nfsd4_release_compoundargs,
1754                .pc_cachetype = RC_NOCACHE,
1755                .pc_xdrressize = NFSD_BUFSIZE/4,
1756        },
1757};
1758
1759struct svc_version      nfsd_version4 = {
1760                .vs_vers        = 4,
1761                .vs_nproc       = 2,
1762                .vs_proc        = nfsd_procedures4,
1763                .vs_dispatch    = nfsd_dispatch,
1764                .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1765};
1766
1767/*
1768 * Local variables:
1769 *  c-basic-offset: 8
1770 * End:
1771 */
1772
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